Final answer:
Roasting a marshmallow is an example of an endothermic process where heat from a campfire (exothermic reaction) is absorbed by the marshmallow to facilitate the change it undergoes when it cooks.
Step-by-step explanation:
Roasting a marshmallow over a campfire provides a practical display of endothermic and exothermic processes in basic thermochemistry. When you roast a marshmallow, the heat from the campfire (an exothermic reaction) is absorbed by the marshmallow. This is an endothermic process as the marshmallow needs to absorb heat to undergo the change it does when it is being roasted.